Slide 3

Say whether these processes are exothermic.1. Charcoal burning yes2. A candle burning. yes3. A kettle boiling no4. Ice melting no5. A firework exploding yes You have to put energy in for boiling and melting. You get heat energy out from all the other processes…read more

Slide 4

Slide 5

Exothermic Reactions· If heat is given out this energy must have come from chemical energy in the reactants 25o 45 o C Reactants convert chemical energy to heat energy The temperature rises…read more

Slide 6

Exothermic ReactionsAlmost immediately the hot reaction products start tolose heat to the surroundings and eventually they returnto room temperature 25o C 45 Chemical energy becomes heat energy. The reaction mixture gets hotter. Eventually this heat is lost to the surroundings. It follows that reaction products have less chemical energy than the reactants had to start with.…read more